MTL 8922-RB-IS Railbus Intrinsically Safe Bus Isolator

MTL 8922-RB-IS Railbus Intrinsic Safety Bus Isolator
This module belongs to the MTL PAC8000 (formerly MTL8000) DCS system acquired by Eaton. It is an essential bus isolation component for building an intrinsic safety I/O system in a 2/1 architecture, specifically designed for protecting the instrument bus in hazardous working environments.

I. Core Hardware Parameters Table
Parameters Specification Details
Overall dimensions Width 110mm × Height 160mm × Depth 42mm
Overall weight 345g
Installation method Standard DIN35 rail clip installation, deployed inside the cabinet
Maximum tolerance for intrusion voltage 250V, blocking the spread of high-voltage faults
Electrical isolation strength 2500V electrical isolation
Upper limit of safe bus power supply 50mA@12V
Upper limit of safe bus power supply on the safety side 60mA@12V
Maximum power consumption of the entire unit 1.2W
Protection level IP20 (for indoor control cabinets)
Operating temperature -25℃~+70℃ industrial wide temperature range

Core functional features
Overall isolation protection at the bus level
Complete electrical isolation for two sections of Railbus buses, capable of resisting the intrusion of the highest 250V fault voltage, protecting all downstream safe (IS) field wiring modules at once, without the need to install isolation barriers on individual channels, saving control cabinet space and reducing the cost of individual channel hardware, maintaining a high-density layout of modules.
Compatible with 2/1 redundant system architecture
It is a standard accessory for the MTL8000 series 2/1 type safe I/O modules, isolating the safety zone of the control room from the hazardous zone of the field buses, limiting the energy of electrical sparks in the loop, meeting the inherent safety specifications of explosion-proof scenarios.
Stable transmission with anti-interference
Cutting off ground loop interference and industrial surge noise in different bus sections, ensuring stable transmission of long-distance distributed instrument signals; a single-line short circuit fault will not spread to the entire network, reducing the scope of downtime.
Compact and easy to maintain
Rail installation is convenient to disassemble and assemble, equipped with complete explosion-proof certification, suitable for control cabinet wiring renovation in high-risk workshops such as oil and gas, chemical engineering, etc.

Typical application scenarios
Petrochemical, refining plants: PAC8000 DCS tank area, reactor safe instrument bus segment isolation;
Offshore oil and gas platforms: Distributed explosion-proof measurement point networking, making bus-level safety zoning;
Replacement of old MTL8000 legacy systems with spare parts, direct plug-and-play replacement of faulty modules;
Safe chemical, pharmaceutical explosion-proof workshops: Analog/switching safe I/O cluster bus protection.